Spell Storing Armour and Metamagic Rods

No. Metamagic rods function in such a way that they apply the metamagic as the spell is being cast. Storing a spell is not casting a spell. You could, however, use a metamagic feat to store a metamagic-'ed spell in your armor.

For the crit question, the spell storing armor only triggers when you are hit, not when you hit. Spell storing weapons on the other hand trigger on hit/damage that you deal. Tho, that is a free action that will cast the spell, and unlike spellstrike, doesn't have the part where it says you deliver the spell through the weapon, nor does it say it uses the weapons crit range. It also doesn't need to be a touch spell for the spell storing weapon, just targeted. If it is a touch spell, you'll still have to roll it's seperate touch attack though.